Blast furnace gas burns with a blue flame due to the presence of____________________?
Show answer Hide answer
Answer: A. CO
Explanation
Carbon monoxide gas burns readily with a distinct, luminous blue flame color. Blast furnace gas contains high concentrations of carbon monoxide as a primary fuel component. The spectral emission of burning carbon monoxide naturally produces visible blue light wavelengths. Carbon monoxide is a poisonous, flammable gas produced during incomplete carbon combustion. It is a major combustible constituent found in industrial steelmaking byproduct fuel gases. Flame color is a reliable qualitative indicator of specific chemical compounds undergoing combustion.
Operators use flame characteristics to quickly assess the quality and consistency of fuel gases. Combustion safety systems monitor burner flames to detect abnormal fuel mixture compositions. The characteristic blue flame serves as a visual warning of carbon monoxide presence. Option B mentions methane which typically burns with a pale blue or yellow-tinged flame. Option C is an inert combustion product that does not burn or produce a flame. Option D lists sulfur which burns with a distinct blue flame but is not the main gas.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. How does an increase in equilibrium moisture content affect coal properties___________________?
Show answer Hide answer
Answer: B. Swelling number decreases
Excess moisture disrupts the formation of the critical plastic layer during coal heating. Water absorbs thermal energy as it evaporates, altering the softening behavior of the coal. Poor plastic layer development directl...
Q2. Assam coals from India suffer principally from elevated levels of ______________ content.
Show answer Hide answer
Answer: C. Sulphur (4-6%)
Geological formations in the Assam region created coal seams rich in sulfur compounds. Both organic and inorganic sulfur concentrations reach exceptionally high levels in these specific coals. Chemical analysis consisten...
Q3. How is blast furnace coke produced from raw coal_____________________?
Show answer Hide answer
Answer: B. High temperature carbonisation
High temperature carbonization drives off all volatile matter leaving a strong carbon residue. Furnace temperatures reaching up to eleven hundred degrees Celsius transform softening coal into coke. Excluding air prevents...
Q4. What applications utilize benzol_____________________?
Show answer Hide answer
Answer: C. Both A. & B.
Benzol is recovered from raw coke oven gas to be used directly as motor fuel. Fractional distillation of crude benzol separates valuable benzene, toluene, and xylene chemicals. Both direct fuel blending and chemical refi...
Q5. Why is actual flame temperature consistently lower than adiabatic flame temperature________________?
Show answer Hide answer
Answer: C. Both A. and B.
Radiation heat losses continuously transfer thermal energy away from the combustion flame zone. Incomplete combustion reactions fail to release the maximum theoretical chemical heat energy potential. Both thermal losses...
Q6. Calorific values of _____________ fuels are determined using a bomb calorimeter.
Show answer Hide answer
Answer: D. Both B. and C.
A bomb calorimeter is specifically engineered to test solid and liquid fuel samples. High-pressure oxygen combustion inside a sealed metal bomb ensures complete fuel oxidation. Both solid coals and liquid fuel oils are r...